* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
      background: #f4f9fc;
      color: #1e2a3a;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 头部导航 */
    .site-header {
      background: linear-gradient(135deg, #0b4f6c 0%, #1b7f8c 100%);
      color: #fff;
      padding: 12px 0;
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
    }
    .logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .ai-page-logo {
      max-height: 44px;
      width: auto;
    }
    .ai-page-home-link {
      color: #e0f2f1;
      font-weight: 500;
      margin-left: 8px;
      font-size: 0.95rem;
      transition: color 0.2s;
    }
    .ai-page-home-link:hover {
      color: #ffffff;
      text-decoration: underline;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
      flex-wrap: wrap;
    }
    .nav-links li a {
      color: #d9f2f0;
      font-size: 0.92rem;
      padding: 8px 12px;
      display: inline-block;
      transition: background 0.2s, color 0.2s;
      border-radius: 6px;
      white-space: nowrap;
    }
    .nav-links li a:hover {
      background: rgba(255,255,255,0.15);
      color: #fff;
    }
    .nav-cta {
      background: #fbbf24;
      color: #1e2a3a !important;
      font-weight: 600;
      border-radius: 40px;
      padding: 8px 20px !important;
    }
    .nav-cta:hover {
      background: #f59e0b !important;
      color: #1e2a3a !important;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: 2px solid #fff;
      color: #fff;
      font-size: 1.6rem;
      padding: 4px 12px;
      border-radius: 8px;
      cursor: pointer;
      line-height: 1;
    }
    /* Hero 首屏 - 无图片 */
    .hero {
      background: radial-gradient(circle at 20% 30%, #c2e9f0, transparent 50%),
                  radial-gradient(circle at 80% 70%, #b2e0e8, transparent 50%),
                  linear-gradient(145deg, #e1f5fe 0%, #f4f9fc 100%);
      padding: 80px 0 70px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -60px;
      right: -80px;
      width: 300px;
      height: 300px;
      background: rgba(27, 127, 140, 0.06);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero::after {
      content: '';
      position: absolute;
      bottom: -40px;
      left: -40px;
      width: 240px;
      height: 240px;
      background: rgba(251, 191, 36, 0.06);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-content {
      max-width: 780px;
      margin: 0 auto;
      text-align: center;
      position: relative;
      z-index: 2;
    }
    .hero-badge {
      display: inline-block;
      background: #d0eef5;
      color: #0b4f6c;
      font-size: 0.85rem;
      font-weight: 600;
      padding: 6px 18px;
      border-radius: 30px;
      letter-spacing: 0.5px;
      margin-bottom: 24px;
      border: 1px solid rgba(27,127,140,0.2);
      animation: floatIn 0.7s ease-out;
    }
    .hero h1 {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1.25;
      color: #0d3b4a;
      margin-bottom: 20px;
      animation: fadeUp 0.8s ease-out;
    }
    .hero h1 span {
      background: linear-gradient(135deg, #1b7f8c, #2da8b8);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: #2e4a5a;
      margin-bottom: 32px;
      max-width: 640px;
      margin-left: auto;
      margin-right: auto;
      animation: fadeUp 0.9s ease-out;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 18px;
      animation: fadeUp 1s ease-out;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 34px;
      border-radius: 60px;
      font-weight: 600;
      font-size: 1rem;
      transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: linear-gradient(135deg, #1b7f8c, #0d5e6b);
      color: #fff;
      box-shadow: 0 8px 18px rgba(27, 127, 140, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(27, 127, 140, 0.4);
    }
    .btn-outline {
      background: transparent;
      color: #0d5e6b;
      border: 2px solid #1b7f8c;
    }
    .btn-outline:hover {
      background: rgba(27, 127, 140, 0.08);
      transform: translateY(-2px);
    }
    .hero-stats {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 32px;
      margin-top: 48px;
      animation: fadeUp 1.1s ease-out;
    }
    .hero-stat-item {
      text-align: center;
    }
    .hero-stat-number {
      font-size: 1.9rem;
      font-weight: 800;
      color: #0d3b4a;
    }
    .hero-stat-label {
      font-size: 0.9rem;
      color: #4a6675;
    }
    /* 通用区块样式 */
    section {
      padding: 64px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 600;
      color: #1b7f8c;
      background: #d9f0f5;
      padding: 4px 18px;
      border-radius: 30px;
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: #0d3b4a;
      margin-bottom: 12px;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: #4a6675;
      max-width: 620px;
      margin: 0 auto;
    }
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .card {
      background: #ffffff;
      border-radius: 24px;
      padding: 28px 22px;
      box-shadow: 0 8px 24px rgba(0, 40, 50, 0.05);
      border: 1px solid rgba(27, 127, 140, 0.1);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: 0 18px 36px rgba(13, 59, 74, 0.1);
    }
    .card-icon {
      width: 48px;
      height: 48px;
      background: #e1f5fe;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: #0d5e6b;
      font-size: 1.6rem;
    }
    .card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: #0d3b4a;
      margin-bottom: 10px;
    }
    .card p {
      color: #4a6675;
      font-size: 0.95rem;
    }
    /* 数据指标 */
    .metrics-bar {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      background: #ffffff;
      border-radius: 60px;
      padding: 28px 20px;
      box-shadow: 0 6px 20px rgba(0, 40, 50, 0.05);
      margin-top: 20px;
      border: 1px solid rgba(27,127,140,0.15);
    }
    .metric-item {
      text-align: center;
      padding: 8px 12px;
    }
    .metric-number {
      font-size: 2rem;
      font-weight: 800;
      color: #0d5e6b;
    }
    .metric-label {
      font-size: 0.9rem;
      color: #4a6675;
    }
    /* 流程步骤 */
    .steps {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 16px;
      counter-reset: step;
    }
    .step-item {
      flex: 1 1 180px;
      background: #ffffff;
      border-radius: 20px;
      padding: 24px 18px;
      box-shadow: 0 4px 14px rgba(0, 40, 50, 0.04);
      position: relative;
      border: 1px solid rgba(27,127,140,0.1);
      transition: transform 0.3s;
    }
    .step-item:hover {
      transform: translateY(-4px);
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, #1b7f8c, #0d5e6b);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .step-item h4 {
      font-size: 1rem;
      color: #0d3b4a;
      margin-bottom: 6px;
    }
    .step-item p {
      font-size: 0.9rem;
      color: #4a6675;
    }
    /* 对比表格 */
    .table-wrap {
      overflow-x: auto;
      background: #ffffff;
      border-radius: 24px;
      padding: 4px;
      box-shadow: 0 8px 24px rgba(0, 40, 50, 0.05);
      border: 1px solid rgba(27,127,140,0.12);
    }
    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 680px;
    }
    th {
      background: #e9f5f8;
      color: #0d3b4a;
      font-weight: 700;
      text-align: left;
      padding: 16px 20px;
      border-bottom: 2px solid #c2e2ea;
      font-size: 0.95rem;
    }
    td {
      padding: 14px 20px;
      border-bottom: 1px solid #e2eff3;
      color: #2e4a5a;
      font-size: 0.95rem;
    }
    tr:last-child td {
      border-bottom: none;
    }
    .highlight-cell {
      background: #f0fafc;
      font-weight: 600;
      color: #0d5e6b;
    }
    .star-rating {
      color: #fbbf24;
      letter-spacing: 2px;
    }
    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border-radius: 16px;
      margin-bottom: 14px;
      border: 1px solid rgba(27,127,140,0.12);
      overflow: hidden;
      transition: box-shadow 0.2s;
    }
    .faq-item:hover {
      box-shadow: 0 6px 18px rgba(13,59,74,0.06);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 24px;
      font-weight: 600;
      font-size: 1.02rem;
      color: #0d3b4a;
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background: #f4fafc;
    }
    .faq-question::after {
      content: '＋';
      font-size: 1.4rem;
      color: #1b7f8c;
      transition: transform 0.3s;
    }
    .faq-item.active .faq-question::after {
      content: '－';
      transform: rotate(0);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s;
      padding: 0 24px;
      color: #4a6675;
      font-size: 0.95rem;
      background: #ffffff;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px 24px;
    }
    /* 评论卡片 */
    .review-card {
      background: #ffffff;
      border-radius: 24px;
      padding: 28px 24px;
      box-shadow: 0 6px 18px rgba(0, 40, 50, 0.04);
      border: 1px solid rgba(27,127,140,0.1);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .review-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 14px 28px rgba(13, 59, 74, 0.08);
    }
    .review-stars {
      color: #fbbf24;
      font-size: 1.1rem;
      letter-spacing: 2px;
      margin-bottom: 14px;
    }
    .review-text {
      color: #2e4a5a;
      font-size: 0.98rem;
      margin-bottom: 18px;
      line-height: 1.65;
    }
    .review-author {
      font-weight: 700;
      color: #0d3b4a;
      font-size: 0.95rem;
    }
    .review-role {
      font-size: 0.85rem;
      color: #5f7e8c;
    }
    /* 案例/文章卡片 */
    .case-card {
      background: #ffffff;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 6px 20px rgba(0, 40, 50, 0.05);
      border: 1px solid rgba(27,127,140,0.1);
      transition: transform 0.3s;
    }
    .case-card:hover {
      transform: translateY(-6px);
    }
    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #e1f5fe;
      overflow: hidden;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
    }
    .case-body {
      padding: 20px;
    }
    .case-body h3 {
      font-size: 1.1rem;
      color: #0d3b4a;
      margin-bottom: 8px;
    }
    .case-body p {
      color: #4a6675;
      font-size: 0.9rem;
    }
    /* 标签云 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 28px;
    }
    .tag {
      background: #ffffff;
      border: 1px solid #cde3ea;
      color: #1b6a7a;
      padding: 6px 18px;
      border-radius: 40px;
      font-size: 0.9rem;
      transition: background 0.2s, transform 0.2s;
    }
    .tag:hover {
      background: #e1f5fe;
      transform: translateY(-2px);
    }
    /* 表单 */
    .form-section {
      background: #ffffff;
      border-radius: 32px;
      padding: 40px 36px;
      box-shadow: 0 8px 28px rgba(0, 40, 50, 0.06);
      border: 1px solid rgba(27,127,140,0.12);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-full {
      grid-column: 1 / -1;
    }
    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: #0d3b4a;
      margin-bottom: 6px;
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1.5px solid #d3e4ea;
      border-radius: 14px;
      font-size: 0.95rem;
      background: #f9fdfe;
      color: #1e2a3a;
      transition: border 0.2s, box-shadow 0.2s;
      font-family: inherit;
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      outline: none;
      border-color: #1b7f8c;
      box-shadow: 0 0 0 4px rgba(27,127,140,0.12);
    }
    .form-group textarea {
      resize: vertical;
      min-height: 110px;
    }
    .form-submit {
      margin-top: 10px;
    }
    /* 页脚 */
    .site-footer {
      background: #0d3b4a;
      color: #d8edf2;
      padding: 52px 0 24px;
      margin-top: 40px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 18px;
      font-weight: 600;
    }
    .footer-col p,
    .footer-col li,
    .footer-col a {
      color: #b8d7e0;
      font-size: 0.9rem;
      line-height: 1.9;
      list-style: none;
      transition: color 0.2s;
    }
    .footer-col a:hover {
      color: #fbbf24;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.12);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #9ec5d0;
    }
    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 18px;
      justify-content: center;
      margin-bottom: 12px;
    }
    .footer-links a {
      color: #b8d7e0;
      font-size: 0.85rem;
    }
    .footer-links a:hover {
      color: #fbbf24;
    }
    /* 浮动客服 */
    .float-service {
      position: fixed;
      right: 24px;
      bottom: 90px;
      z-index: 200;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .float-btn {
      width: 52px;
      height: 52px;
      background: #ffffff;
      border-radius: 50%;
      box-shadow: 0 6px 20px rgba(13, 59, 74, 0.2);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      color: #0d5e6b;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s;
      border: none;
      text-decoration: none;
    }
    .float-btn:hover {
      transform: scale(1.08);
      box-shadow: 0 10px 26px rgba(13, 59, 74, 0.3);
    }
    #backToTop {
      display: none;
    }
    /* 动画 */
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }
    @keyframes floatIn {
      from { opacity: 0; transform: scale(0.9); }
      to { opacity: 1; transform: scale(1); }
    }
    .reveal {
      opacity: 0;
      transform: translateY(26px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }
    /* 移动端适配 */
    @media (max-width: 900px) {
      .grid-3, .grid-2, .grid-4, .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        padding: 12px 0 4px;
      }
      .nav-links.open {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .header-inner {
        align-items: flex-start;
      }
      .hero h1 {
        font-size: 2rem;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 640px) {
      .grid-3, .grid-2, .grid-4, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero h1 {
        font-size: 1.75rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .hero-stats {
        gap: 20px;
      }
      .steps {
        flex-direction: column;
      }
      .container {
        padding: 0 18px;
      }
      .form-section {
        padding: 28px 20px;
      }
      .float-service {
        right: 14px;
        bottom: 70px;
      }
    }